{"product_id":"adjustable-0-30v-2ma-3a-dc-lab-power-supply-diy-kit-short-circuit-protection","title":"Adjustable 0–30V 2mA–3A DC Laboratory Power Supply DIY Kit | Short-Circuit \u0026 Current Limit Protection | Arduino","description":"\u003ch2\u003eAdjustable 0–30V \/ 2mA–3A DC Laboratory Power Supply DIY Kit — Short-Circuit \u0026amp; Current Limit Protection\u003c\/h2\u003e\n\n\u003cp\u003eBuild your own professional-grade adjustable DC laboratory power supply with this comprehensive DIY kit. Covering \u003cstrong\u003e0–30V output voltage\u003c\/strong\u003e and \u003cstrong\u003e2mA–3A output current\u003c\/strong\u003e — both continuously adjustable — this kit delivers the core functionality of a bench power supply at a fraction of the cost. The ultra-low output ripple (0.01%), short-circuit protection, and adjustable current limiting make it suitable for powering sensitive electronics, testing circuits, charging batteries, and driving LEDs with precision current control. All components are through-hole (straight-insert) for easy hand-soldering, making this an excellent intermediate-level electronics assembly project.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e24V AC (external transformer required)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3A max\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0V – 30V DC (continuously adjustable)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2mA – 3A (continuously adjustable)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Voltage Ripple\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≤0.01% (excellent regulation)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMinimum Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2mA (suitable for LED and Zener diode testing)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShort-Circuit Protection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes (automatic)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOverload Protection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes — LED indicator activates when current exceeds set limit\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eComponent Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eThrough-hole (straight-insert), DIY assembly required\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat Makes a Good Lab Power Supply?\u003c\/h3\u003e\n\u003cp\u003eA laboratory power supply differs from a simple wall adapter in three critical ways:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAdjustable voltage\u003c\/strong\u003e — set the exact voltage your circuit requires, from 0V to 30V, without fixed voltage rails\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAdjustable current limiting\u003c\/strong\u003e — set a maximum current to protect sensitive components from overcurrent damage during testing\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow ripple\u003c\/strong\u003e — 0.01% ripple means the output is a clean, stable DC voltage, not a noisy approximation that can cause circuit instability\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e✅ \u003cstrong\u003e0–30V continuously adjustable\u003c\/strong\u003e — covers 1.5V, 3.3V, 5V, 9V, 12V, 24V and any custom voltage\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003e2mA–3A current range\u003c\/strong\u003e — from microampere-sensitive LED testing to 3A motor and power circuit testing\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003e0.01% output ripple\u003c\/strong\u003e — ultra-clean DC output for sensitive analog and RF circuit testing\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eShort-circuit protection\u003c\/strong\u003e — automatically limits current on short circuit, protecting both the supply and the circuit under test\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eLED overcurrent indicator\u003c\/strong\u003e — visual alert when output current exceeds the set current limit\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eThrough-hole components\u003c\/strong\u003e — all components are easy to hand-solder, suitable for intermediate builders\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003e2mA minimum current\u003c\/strong\u003e — low enough to safely test LEDs and Zener diodes without burning them out\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat You Need to Complete the Build\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e24V AC transformer (not included) — rated at 3A or higher\u003c\/li\u003e\n  \u003cli\u003eSoldering iron and solder\u003c\/li\u003e\n  \u003cli\u003eMultimeter (for calibration and testing)\u003c\/li\u003e\n  \u003cli\u003eEnclosure (optional, for a finished bench supply)\u003c\/li\u003e\n  \u003cli\u003eVoltage and current display meters (optional, for front-panel readout)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCommon Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eArduino and microcontroller circuit testing and development\u003c\/li\u003e\n  \u003cli\u003eLED forward voltage and current characterisation\u003c\/li\u003e\n  \u003cli\u003eZener diode breakdown voltage testing\u003c\/li\u003e\n  \u003cli\u003eLi-ion and LiPo battery charging (with current limiting)\u003c\/li\u003e\n  \u003cli\u003eTransistor and MOSFET circuit testing\u003c\/li\u003e\n  \u003cli\u003eAnalog circuit development and debugging\u003c\/li\u003e\n  \u003cli\u003eElectronics education and lab experiments\u003c\/li\u003e\n  \u003cli\u003eDIY bench power supply build project\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this kit pre-assembled or do I need to solder it?\u003c\/strong\u003e\u003cbr\u003eA: This is a \u003cstrong\u003eDIY kit\u003c\/strong\u003e — all components are included but require soldering. All components are through-hole (straight-insert) for easy hand-soldering. Intermediate soldering skills are recommended.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What transformer do I need?\u003c\/strong\u003e\u003cbr\u003eA: A 24V AC transformer rated at 3A or higher is required. This is not included in the kit. A standard toroidal or EI-core transformer with a 24V AC secondary winding is suitable.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this to charge lithium batteries?\u003c\/strong\u003e\u003cbr\u003eA: Yes. Set the output voltage to the appropriate charge voltage (e.g., 4.2V for 1S Li-ion) and set the current limit to the desired charge rate. Monitor the charging process — this kit does not include automatic charge termination.\u003c\/p\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× Adjustable DC Laboratory Power Supply DIY Kit (all through-hole components, PCB, and assembly instructions)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Keszoox","offers":[{"title":"Default Title","offer_id":46985505767659,"sku":"\u003cnone\u003e","price":57.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/adjustable-0-30v-2ma-3a-dc-lab-power-arduino.webp?v=1761279436","url":"https:\/\/keszoox.com\/products\/adjustable-0-30v-2ma-3a-dc-lab-power-supply-diy-kit-short-circuit-protection","provider":"Keszoox","version":"1.0","type":"link"}